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There's a thread called "Random Useful Information" that has a .txt file filled with answers to this kind of question. Basically, BPM = Tempo * 6 / Speed. So if your Speed is 6, then BPM = Tempo.
Also, in FamiTracker, for the purposes of BPM, one "beat" is defined as four Rows. So if you're composing in some time signature other than 4/4, you might have to do some calculation to get the tempo you want.
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